Being the sequel to the first Space Mutant movie, it would most likely feature the Space Mutants taking revenge on their opponents, which won in the last battle. The only part seen was a spaceship landing on a planet, the door of it opening, to reveal a three-eyed, octupus-tailed monster resembling Bart.

Bart, Lisa and Maggie were given money by their parents to see Return of the Happy Little Elves, the sequel to the first Happy Little Elves movie. Bart did not like the Happy Little Elves films, and considered the Space Mutants movie themselves. Bart paid the attendant and entered the screen the movie was playing on. They, and an old man, were the only people in the screening room, implying that it was a critically-hated film. After Bart explained to his sisters what to expect in the movie, while scoffing popcorn. They gulped and the room went black. The film started, showing the title card, and the movie played. When the screen showed a monster resembling himself, Bart screamed, waking the old man in the back of the room, and his sisters held his hands.